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Problem 0. Below is the C code for 3 functions, foo, bar, and bazz; foo calls bar, which calls bazz. Each has some local variables. long bazz (long *p1, long q) { if (q < 3L) return *p1 + 1; else return bazz (p1,q−1)+1; } long bar (long *m, long *n) { long x = *n; *m += bazz (m, 3L); return x + *m; } long foo(long x, long *y) { long a = x + *y; return *y+bar (y, &a); } Here is the assembly code generated for each: bazz: .L2: cmpq $2, %rsi jg .L2 movq (%rdi), %rax addq $1, %rax ret subq $8, %rsp subq $1, %rsi call bazz addq $1, %rax addq $8, %rsp ret

Problem 0. Below is the C code for 3 functions, foo, bar, and bazz; foo calls bar, which calls bazz. Each has some local variables. long bazz (long *p1, long q) { if (q < 3L) return *p1 + 1; else return bazz (p1,q−1)+1; } long bar (long *m, long *n) { long x = *n; *m += bazz (m, 3L); return x + *m; } long foo(long x, long *y) { long a = x + *y; return *y+bar (y, &a); } Here is the assembly code generated for each: bazz: .L2: cmpq $2, %rsi jg .L2 movq (%rdi), %rax addq $1, %rax ret subq $8, %rsp subq $1, %rsi call bazz addq $1, %rax addq $8, %rsp ret

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Problem 0. Below is the C code for 3 functions, foo, bar, and bazz; foo calls bar, which calls bazz. Each has some local variables. long bazz (long *p1, long q) { if (q < 3L) return *p1 + 1; else return bazz (p1,q-1)+1; } long bar (long *m, long *n) { long x = *n; *m += bazz (m, 3L); return x + *m; } long foo (long x, long *y) { long a= x + *y; return *y+ bar (y, &a); } Here is the assembly code generated for each: bazz: .L2: cmpq $2, %rsi jg .L2 movq (%rdi), %rax addq $1, %rax ret subq $8, %rsp subq $1, %rsi call bazz addq $1, %rax addq $8, %rsp ret
Transcribed Image Text:Problem 0. Below is the C code for 3 functions, foo, bar, and bazz; foo calls bar, which calls bazz. Each has some local variables. long bazz (long *p1, long q) { if (q < 3L) return *p1 + 1; else return bazz (p1,q-1)+1; } long bar (long *m, long *n) { long x = *n; *m += bazz (m, 3L); return x + *m; } long foo (long x, long *y) { long a= x + *y; return *y+ bar (y, &a); } Here is the assembly code generated for each: bazz: .L2: cmpq $2, %rsi jg .L2 movq (%rdi), %rax addq $1, %rax ret subq $8, %rsp subq $1, %rsi call bazz addq $1, %rax addq $8, %rsp ret
bar: foo: pushq %rbp pushq %rbx subq $8, %rsp movq %rdi, rbx movq (rsi), %rbp movl $3, %esi call bazz addq (%rbx), rax movq rax, (%rbx) addq %rbp, %rax addq $8, %rsp popq rbx popq %rbp ret pushq rbx subq $16, %rsp movq %rdi, %rax movq %rsi, %rdi xorl %edx, %edx movq (%rsi), %rbx addq rbx, rax movq %rax, (%/rsp) movq %rsp, %rsi call bar addq rbx, rax jne .L12 addq $16, %rsp popq rbx ret Suppose foo (10,&y) is called from main, where long y contains the value 0. Assume register %rbx contains a value a, %rbp contains 3., and %rsp contains y at the time foo is invoked. a. Draw a diagram of the stack immediately after the second invocation of bazz Treat the stack as an array of 8-byte quantities. The stack frame of main will be at the top of the diagram. (You will only know the contents of y in the frame of main) The top of the stack (i.e., the frame of the recursive invocation of bazz) at the bottom. Show the contents of each long on the stack. If it is unknown, leave it blank. b. What value does foo (10,&y) return?
Transcribed Image Text:bar: foo: pushq %rbp pushq %rbx subq $8, %rsp movq %rdi, rbx movq (rsi), %rbp movl $3, %esi call bazz addq (%rbx), rax movq rax, (%rbx) addq %rbp, %rax addq $8, %rsp popq rbx popq %rbp ret pushq rbx subq $16, %rsp movq %rdi, %rax movq %rsi, %rdi xorl %edx, %edx movq (%rsi), %rbx addq rbx, rax movq %rax, (%/rsp) movq %rsp, %rsi call bar addq rbx, rax jne .L12 addq $16, %rsp popq rbx ret Suppose foo (10,&y) is called from main, where long y contains the value 0. Assume register %rbx contains a value a, %rbp contains 3., and %rsp contains y at the time foo is invoked. a. Draw a diagram of the stack immediately after the second invocation of bazz Treat the stack as an array of 8-byte quantities. The stack frame of main will be at the top of the diagram. (You will only know the contents of y in the frame of main) The top of the stack (i.e., the frame of the recursive invocation of bazz) at the bottom. Show the contents of each long on the stack. If it is unknown, leave it blank. b. What value does foo (10,&y) return?
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